(19)
(11) EP 0 477 014 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.04.1993 Bulletin 1993/16

(43) Date of publication A2:
25.03.1992 Bulletin 1992/13

(21) Application number: 91308556.9

(22) Date of filing: 19.09.1991
(51) International Patent Classification (IPC)5: G09G 3/30
(84) Designated Contracting States:
DE GB

(30) Priority: 19.09.1990 JP 251076/90

(71) Applicant: SHARP KABUSHIKI KAISHA
Osaka 545 (JP)

(72) Inventors:
  • Sakamoto, Atsushi
    Nara-shi, Nara-ken (JP)
  • Harada, Shigeyuki
    Nara-shi, Nara-ken (JP)
  • Yamamoto, Kyoichi
    Yamatokoriyama-shi, Nara-ken (JP)
  • Ohba, Toshihiro
    Nara-shi, Nara-ken (JP)
  • Kishishita, Hiroshi
    Nara-shi, Nara-ken (JP)

(74) Representative: Brown, Kenneth Richard et al
R.G.C. Jenkins & Co. 26 Caxton Street
London SW1H 0RJ
London SW1H 0RJ (GB)


(56) References cited: : 
   
       


    (54) Display unit having brightness control function


    (57) A display unit comprising a thin film EL display panel, a scanning side switching circuit connected to a scanning side electrode, a data side switching circuit connected to a data side electrode, a scanning side drive circuit which outputs a high voltage pulse to the scanning side switching circuit and a data side drive circuit which outputs a signal voltage to the data side switching circuit, in which means for decreasing a pulse width of a high voltage pulse supplied from the scanning side drive circuit to the scanning side switching circuit in accordance with an increase of the level of a high voltage generated by a high voltage power supply in the scanning side drive circuit.






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